title: Structural features of transmembrane helices.
mesh_terms: D000595:Amino Acid Sequence; D006860:Hydrogen Bonding; D057927:Hydrophobic and Hydrophilic Interactions; D008565:Membrane Proteins / Q000737:chemistry*; D008958:Models, Molecular; D017433:Protein Structure, Secondary; D014961:X-Ray Diffraction
chemical_list: D008565:Membrane Proteins